Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f27fbcde318a8e…

MALICIOUS

PDF

54.4 KB Created: 2020-08-07 19:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a774f57072cc212289f8f705b54a4361 SHA-1: 2faa1761345bc6694f4541567bd326dfa6b49bf2 SHA-256: 51f27fbcde318a8e2db2d517c1e6d6514361de665231a6910760643b2d323cf9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including a primary link to a redirector at `ttraff.com`. This redirector is likely used to obscure the final malicious destination. The PDF also contains a large number of links to Shopify domains, which are likely part of a link farm to improve search engine ranking for the malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=allophones+in+linguistics+pdf
    • http://files.dynamicwealth.ca/uploads/1/3/0/8/130813366/ribuv.pdf
    • http://files.alirazaartist.com/uploads/1/3/2/6/132682607/9ca02.pdf
    • http://fiwefukud.imsea2019.com/uploads/1/3/1/8/131872225/matapufenal-borilaga.pdf
    • http://files.newenglandsunroomrepair.com/uploads/1/3/0/7/130775516/jedetavisobogaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2954/files/42473071687.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/24720951532.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarozasupevukofapunaxovu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4035/6005/files/jefedebamewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/45936180972.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/vodojubijotunibewexowosag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/funorubatokuzalu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/jikukol.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/55631165352.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/famulogux.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/86890799380.pdf
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/wuwexewavinekujanigujo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bb3.bin
858d634ceb03b3305a89cde3e3adcd4a86c2300b29fe391cc5e47dcdf9b4650a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB3 5100 bytes
font_01_sfnt_off00009d1c.bin
ab0d55aa5a391d99faf2b10910f8297e0b109d711511b3bf6bfce005e1d45592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1C 14492 bytes

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